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The Design Reference Asteroid (DRA) is a compilation of all that is knownabout the OSIRIS-REx mission target, asteroid (101955) Bennu. It contains ourbest knowledge of the properties of Bennu based on an extensive observationalcampaign that began shortly after its discovery, and has been used to informmission plan development and flight system design. The DRA will also becompared with post-encounter science results to determine the accuracy of ourEarth-based characterization efforts. The extensive observations of Bennu in1999 has made it one of the best-characterized near-Earth asteroids. Manyphysical parameters are well determined, and span a number of categories:Orbital, Bulk, Rotational, Radar, Photometric, Spectroscopic, Thermal, SurfaceAnalog, and Environment Properties. Some results described in the DRA have beenpublished in peer-reviewed journals while others have been reviewed byOSIRIS-REx Science Team members and/or external reviewers. Some data, such asSurface Analog Properties, are based on our best knowledge of asteroidsurfaces, in particular those of asteroids Eros and Itokawa. This publicrelease of the OSIRIS-REx Design Reference Asteroid is a annotated version ofthe internal OSIRIS-REx document OREX-DOCS-04.00-00002, Rev 9 (accepted by theOSIRIS-REx project on 2014-April-14). The supplemental data products thataccompany the official OSIRIS-REx version of the DRA are not included in thisrelease. We are making this document available as a service to future missionplanners in the hope that it will inform their efforts.

The Design Reference Asteroid for the OSIRIS-REx Mission Target (101955) Bennu